606 PROCEEDINGS OF THE NATIONAL MUSEUM. vor. xxxw. 
CYPSILURUS SPILONOTOPTERUS (Bleeker). 
(Cypsilurus bahiensis JoRDAN and EvERMANN, Fishes Hawaii, p. 136, per- 
haps not Hxrocetus bahiensis RANZANI, an Atlantic species.) 
Head measured to end of opercular flap, 44 in length to base of 
caudal; width of body at base of pectorals 64; depth 54; depth of 
caudal peduncle 34 in head; snout 3$; D. 18; A. 10; P. 13; scales in 
lateral series 43; above origin of ventral, counting upward and for- 
ward 10; between occiput and base of dorsal 29. 
Interorbital region concave, the width contained two and one-half 
times in head. Teeth present on jaws and palatines. Gillrakers on 
lower half of arch 17, the length of longest contained about one and 
two-thirds times in longest filaments. First pectoral ray simple, its 
length contained 13 in fin, 22 in head and body; second ray branched, 
the lower part almost equal in length to third ray, which forms the 
NONE EXXON 
205 ae nn STS 
Fic. 2.—CYPSILURUS SPILONOTOPTERUS. 
tip of fin, the latter extending beyond tips of posterior rays of de- 
pressed dorsal and anal, but not reaching base of caudal; branches 
of second ray simple, the lower exceeding the upper in length by a 
distance contained six and one-half times in length of ray, four 
times in length of first ray; branches of third ray divided. Longest 
(third) ray of ventral extending to base of sixth anal ray, the second 
branch of second ray somewhat shorter. Anal inserted below base 
of seventh dorsal ray; height of longest ray 34 in head. Longest 
(third) dorsal ray 2715 in head; last ray not produced; neither dorsal 
nor anal reaching base of caudal when depressed. Dorsal lobe of 
caudal, measured along upper edge, 3% in the length. 
Color in spirits, brownish above, silvery below; pectorals with a 
broad, brown border and a light edge; basal portion of fin brownish, 
the broad space in middle of fin hight. Dorsal with a large black spot 
